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Transformation Tease

Stage: 2 Challenge Level:

Transformation Tease

Here is a set of axes with one shape drawn in the first quadrant:

What is this shape called? What are the coordinates of the points A, B, C and D which form the corners of the shape?

Translate (or move) the shape 3 squares to the left and 4 squares up. What are its new coordinates?
Compare these with the original coordinates. Do you notice about the numbers?

Start with the shape above again. This time reflect it in the x axis. What are the coordinates of the corners now?

What do you see when you compare these coordinates with the original ones?

Predict what the new coordinates would be after a reflection in the y axis.

Plot these three points on the graph:

(-7, 7)
(0, 0)
(7, -7)

Join the points to make a straight line.
This line is called y = -x because at any point on the line the x coordinate is the same as its y coordinate, but negative.
Reflect the starting shape in the line y = -x and give the new coordinates for A, B, C and D.
Look carefully at these new coordinates and then predict what would happen to these points if they were reflected in the line y = -x:

(2, 4)
(6, -4)
(-5, -5)

Now take the original shape again and rotate it 90 o anticlockwise about the origin. What do you notice about the new coordinates?
How else could you describe this transformation?

Why do this problem?

This activity is good to present to pupils who have just started work with co-ordinates. It can also be used in a revision situation.

Possible approach

As shown on the page step by step.

Key questions

text

Possible extension

Create more intricate shapes of their own and explore transformations.

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.